NUT - HEX JAM (Mitsubishi MB115781)

A damaged hex jam nut can compromise the security of a threaded fastener assembly. During inspection, a loose or worn jam nut may allow the primary fastener to back out under vibration. The hex jam nut is a thin-profile nut used to lock another nut or bolt in place. Its primary mechanical function is to provide a secondary locking force against the primary fastener. A common failure consequence is that a missing or stripped jam nut leads to gradual loosening of the bolted joint. This aftermarket replacement part references the Mitsubishi catalog number MB115781. Verify the serial number or application, then call (562) 693-7748.

Part number variants: MB115781, mb115781